Engine cylinder cover



April 6, 1 c. w. BAKE 2,076,068

ENGINE CYLINDER COVER Filed April 15, '1935 [NKENTOR Patented Apr. 6, 1937 UNITED STATES" PATENT OFFICE 4 Claims.

This invention relates to improvements in internal combustion engine cylinder covers havinga chamber through which is circulated a cooling fluid. The objects of improvement are, to provide a cover in which the transfer of heat caused by combustion within the cylinder and combustion chamber will be more rapid than heretofore; a cover easily made and cheap to manufacture, and allowing of a higher ratio of compression.

I attain these objects by the structure illustrated in the accompanying drawing, in which Fig. 1 is a sectional view through the cover at one of the engine cylinders.

Fig. 2 is an underside plan view of a cast metal body of the cover made in accordance with the present invention, and Fig. 3 is an underside plan view of the. heat transfer plate of the cover.

Similar numerals refer to similar parts throughout the several views in which- I is the cover body having the usual holding bolts 2 for securing the cover to the cylinder block, a cylinder closing face In and a cooling fluid chamber 3, wall 4 adjacent the cylinder bore 5 and separating the chamber from theface Ia. Through the wall 4 are a plurality of cooling fluid holes or perforations 6 whereby the cooling fluid is free to come in contact with the heat transfer plate 1 which is shaped to conform with the top of the cylinder block 8 and to a combustion chamber 9. 9a is a combustion chamber receiving pocket or cavity wherein the combustion chamber portion of the heat transfer plate I fits. 9b represents the outside of the combustion chlamher wall of the heat transfer plate. The heat transfer plate is preferably drawn from copper or hardened copper which has a higher heat conduction factor than the metal of the body. In either case, it is of a material having highheat transfer characteristics. The heat transfer plate has at the ignition spark plug [0, internally screw threaded thimble 12 extending into hole II in the cover body, the internally screw-threaded thimble I2 into which the spark plug is screwed serves to draw the heat transfer plate 1 against the wall l3 of the top of combustion chamber pocket of the cover body by the spark plug. The spark plug when screwed into the thimble l2 and drawn tightly against the cover body around the hole I l 5 prevents leakage of cooling fluid at the hole I l. The heat transfer plate I fits snugly against the cover body and into the depression forming the combustion chamber pocket 9a, which corresponds to the outside of the wall 812 of. that por- 55 tion of the heat transfer plate forming the com when the poorer grades of gasolineare employed.

bustion chamber. Interrupted line L represents the circumferential line of the cylinder and shows the distribution of holes 6.

Mypresent invention has a higher heat conduction than either covers made of aluminum or v thos'e'ha'ving copper plugs and inserts. The entire face over the cylinder and the combustion chamber is of'copper or copper alloyed with some other hardening metal such as antimony, zinc and the like having a I very high heat conduction, the transfer of which may be regulated by the number and size of the holes 6 through the wall 4 of the cover, and also, as certain portions adjacent the engine cylinder over-heat more or larger holes are distributed adjacent those portions thus preventing over and irregular heating and consequent premature ignition of the gas charge within the engine thus permitting a high rate of compression in the engine without detonation even The cover consists of a cover body usually of cast iron having a cooling chamber separated from its face by a wall through which are a plurality of properly spaced holes that lead from the cooling fluid chamber to the cover face, the holes being 25 distributed on the. covers face over the, cylinder of the engine and the combustion chamber in positions best suited for uniformly cooling the gases adjacent the heat transfer plate within the cylinder and the combustion chamber of the en- 30 gine by conduction of heat through the heat transfer plate situated between the face of the cover body and the top of the cylinder and having a combustion chamber fitted into a. correspond,-

ing pocket in the cover body. The heat transfer 35 plate preferably 'fitssnugly against the face of the cover body and is supported against upward deflection by the perforated wall 4 or if of suflicient stiffness may be separated slightly to permit cooling fluid to circulate throughout a space between 40 the cover and heat transfer plate. No leakage of cooling fluid can occur to the exterior of the engine because the heat transfer plate is clamped between the face of the cover body and the top of the en gine cylinder block and being of a softer metal than the metal in the cover body and the cylinder block acts as a. packing gasket and takes the place of the usual gasket as at present employed.-

Having described my invention, I claim 1. .An engine cylinder cover structure comprising a cast metal body having a cooling fluid chamber therein, a wall of said chamber having a pocket therein and providing a cylinder closing face, said wall having a plurality of holes extending therethrough and a heat transfer plate extending substantially throughout the entire area of said face and into said pocket and positioned against said iace.

2. An engine cylinder cover structure compris- 5 ing a cast metal body having a cooling fluid cham- 10 against said face and into said pocket.

3. An engine cylinder cover structure comprising a cast metal body having a cooling fluid chamber therein, a wall of said chamber having a pocket therein and providing a cylinder closing face, said wall at said face and within said pocket having a plurality of holes extending therethrough and a heat transfer member extending throughout the entire area of said face and said pocket occupied by said holes and positioned against said iace.

4. An engine cylinder cover structure comprising a cast metal body having a cooling fluid chamber therein, a wall of said chamber having a pocket therein and providing a cylinder closing face, said wall within said pocket having a hole extending therethrough and a heat transfer plate extendingjnto said pocket and over said hole.

CHARLES W. DAKE. 

